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1.
An individual who speaks using precise acronyms, slang, and obscure words related to one or more specialized professions even when not talking to other individuals in the profession; someone who talks over others' heads subconsciously using specialized words.
Bones is such a jargonnaut --- she left the entire jury behind while describing that kid's skeleton.

I don't get invited to parties anymore because whenever I do, I turn into a total jargonnaut and look like an elitist asshole.
 
2.
Someone that delights in using far too many acronyms in front of people that work in different industries.
"Wow, did you catch anything that Simon said? Now he's a Jargonnaut!"
by Emily Crispian November 09, 2011